These are new types of posts available to use on the desktop version of VK and the Android app. You are still able to view posters on the iOS app and the mobile version.

Posters have a 160 character limit or five paragraphs, in which case the limit decreases. If the character limit is exceeded, the format is switched to a regular post.

The font and color of the text depend on the background, so you arent able to change them independently. The text is always centered, and its font size depends on the number of characters on the poster.
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